Comment by andrewmcwatters

God, everyone has one of these stupid stories, don't they? For me, it was some moron at a Wordpress sweatshop who pointed out that the way to find the number of parameters of a function was through (a now deprecated and unsupported!) arity property.

OK, great. 16 years into my career, and I've never needed to count the number of parameters of a JavaScript function. And if you needed to, that wasn't going to be the property you'd read anyway.